Rolling Contact Fatigue Testing of a 3 cSt Polyolester Lubricant with and Without TCP and DODPA/PANA at 177 °C

Trivedi, Hitesh K.; Forster, Nelson H.; Saba, Costandy S.

doi:10.1023/b:tril.0000009734.35530.d8

Cited by 19 publications

(15 citation statements)

References 4 publications

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“…The phosphate ester loses the remaining phenols resulting in a bound iron polyphosphate. The amine antioxidants commonly found in the formulated lubricants were found to negatively impact the fatigue and wear resistance [74]. The most common mechanism for film formation with phosphate esters involves initial adsorption of the phosphate ester on the oxide surface of the iron.…”

Section: Mechanism Of Phosphate Ester Modification Of Metal Surfacesmentioning

confidence: 99%

Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives

Johnson

Hils

2013

Lubricants

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Phosphate esters, thiophosphate esters and metal thiophosphates have been used as lubricant additives for over 50 years. While their use has been extensive, a detailed knowledge of how they work has been a much more recent development. In this paper, the use of phosphate esters and thiophosphate esters as anti-wear or extreme pressure additives is reviewed with an emphasis on their mechanism of action. The review includes the use of alkyl phosphates, triaryl phosphates and metal containing thiophosphate esters. The mechanisms of these materials interacting with a range of iron and steel based bearing material are examined.

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Section: Mechanism Of Phosphate Ester Modification Of Metal Surfacesmentioning

confidence: 99%

Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives

Johnson

Hils

2013

Lubricants

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“…Even at low levels, it is enough to cover the active sites and decrease the performance of a catalyst. In traditional tribology systems, tricresyl phosphate (TCP) has been used as an anti-wear (AW) and extreme pressure (EP) additive with steel parts for the past 60 years [11][12][13][14][15][16]. It is now widely accepted that the effectiveness of TCP as an anti-wear additive is due to the chemical reaction of phosphorus with iron to form an iron phosphate film [15].…”

Section: Introductionmentioning

confidence: 99%

Deactivation Effect of Tricresyl Phosphate (TCP) on Tribochemical Decomposition of Hydrocarbon Oil on a Nascent Steel Surface

et al. 2008

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A nascent surface has high activity to catalyze the decomposition of a lubricant under boundary lubrication conditions. To reduce the decomposition of a lubricant (multialkylated cyclopentane, MAC), tricresyl phosphate (TCP) was introduced as an additive. The tribological properties and decomposition process of lubricants on the nascent surface of bearing steel 52100 were investigated by a ball-on-disk friction tester in a vacuum chamber with a quadrupole mass spectrometer (Q-MS). The addition of TCP prolonged the induction period for decomposition of the lubricant. During the friction processes, hydrogen and gaseous hydrocarbons desorbed as tribochemical reaction products. XPS analysis revealed that the tribofilm from the additive was mainly composed of iron phosphate, which decreased the probability of generating a nascent surface, resulting in the reduction of desorption rate of gaseous products. The critical load for the mechanical activation of the decomposition correspondingly doubled.

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“…Some reactions are inhibited by the additives, but may be accelerated by combinations of additives and surface chemistries. Rolling contact fatigue testing with M-50 bearings, for example indicated that PANA and DODPA added to a lubricant along with tricresyl phosphate resulted in an increase in wear over systems where the PANA and DODPA were absent [35]. An explanation might include the antioxidants reduce the oxidation of the metal surface which interferes with the binding of the phosphate ester to the surface [36].…”

Section: Synergistic Reactions Between Lubricants Additives and Bearmentioning

confidence: 99%

Turbine Engine Lubricant and Additive Degradation Mechanisms

Johnson¹

2019

Aerospace Engineering

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Modern ester based synthetic lubricants have been used in various formulations with anti-oxidants, phosphorus based anti-wear additives and other additives for many years. The physical and chemical properties of both the basestock and additives are known to change through use. Basestocks are normally thought to degrade through various mechanisms, while additive can either degrade or are used as they react when they complete the function that they are added for. In this chapter, the composition of modern turbine engine lubricants and the mechanisms by which the lubricants degrade over time will be examined. Potential changes in bearing materials being evaluated for future engines and the effects of possible new ionic liquids based additives will be will be discussed as they relate to currently used additives. Also included will be a discussion of effects of degradation on the lubricant properties, how the changes affect turbine engines and how the changes can impact human health. These new materials introduce a number of new possible degradation schemes that must be evaluated before the materials enter widespread use.

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Rolling Contact Fatigue Testing of a 3 cSt Polyolester Lubricant with and Without TCP and DODPA/PANA at 177 °C

Cited by 19 publications

References 4 publications

Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives

Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives

Deactivation Effect of Tricresyl Phosphate (TCP) on Tribochemical Decomposition of Hydrocarbon Oil on a Nascent Steel Surface

Turbine Engine Lubricant and Additive Degradation Mechanisms

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